DMI Piston Rod Reconditioning
Piston Rod Reconditioning
  DMI (Drechsler) GmbH, a wholly owned subsidiary of Diesel Marine International Ltd, based in the Port of Hamburg, has developed a unique reconditioning procedure for the piston rods of 2-stroke diesel engines.

  DMI's factories in Europe have for many years offered a reconditioning procedure which incorporates electro deposited chromium, which is very effective, but limited in the layer thickness which can be applied.

  In 1993 DMI (Drechsler) in conjunction with a major European engine builder developed a metal spray process which enables piston rods for all types of 2-stroke engines to be fully reconditioned back to original size quickly and economically. The process eliminates the need for undersized rods and non standard sealing and scraper equipment.

  Worn piston  rods cause high lubricating oil consumption, contamination of crankcase oil and excessive wear and scoring can be a particular problem on the latest generation super long stroke engines.

  The DMI (Drechsler) process provides a hardness of over 500 HV. giving a high resistance to wear. The surface condition of the coating is carefully designed to provide oil retention properties on the running surface of the rods to prevent scoring and local micro seizure.

  DMI (Drechsler) piston rods, can be supplied with the recommended design of scraper ring and guide ring, which will ensure long and reliable service with minimum risk of scoring.

 

  The process is Classification Society approved and DMI (Drechsler) have processed in excess of 400 piston rods in recent years for all types of engines with excelent results.

  Piston rods processed by DMI(Drechsler) for Suzler RTA 84 engines, have been in service for in excess of 30,000 running hours without measurable wear.

 

PISTON RINGS & STUFFING BOX EQUIPMENT
  PISTON RINGS

Lockwood & Carlisle was founded in 1876 and remains one of the famous names in piston rings.

  Lockwood & Carlisle specialises in the specification and distribution of piston,
compressor and stuffing box rings to OEMs and diesel engine users. Large stocks of all types of piston rings and stuffing box equipment are held at Sheffield to provide an immediate response to customer demand. 

  

Piston rings and stuffing box equipment for two and four-stroke diesel engines, compressors and other applications :

  • OEM Supplier
  • Large Stocks
  • Worldwide Distribution

 

  

The main functions of diesel engine piston rings are to maintain gas tight operation and help to provide effective lubrication control and heat transfer in the combustion chamber. Piston rings must also complement the characteristics of other engine components such as the piston and liner and the operating parameters of combustion, cooling and lubrication.

  MATERIALS AND ENGINEERING
  

Materials for L&C rings are specified to provide the appropriate elasticity and wear resistance characteristics. Their chemical composition, the casting process and their subsequent treatment create the relevant distribution of graphite and/or carbides in various grades of martensitic, bairitic or pearlitic molecular structures most suited to particular applications.

L&C piston rings for large two-stroke diesel engines are machined on cam turning machines to produce positive or negative ovality as relevant. When such rings are operating in working conditions the correct seal is formed and the rings benefit from improved thermal stability with minimum tension loss.
  PROFILES AND JOINTS
L&C supplies the full spectrum of ring profiles and joints to provide the necessary gas tightness (compression). Oil dispersion and control, anti-stick or breaking resistance. Expanders contained within certain rings are produced to give increased wall pressure for many engines.
  SURFACE TREATMENTS AND INSERTS
L&C provides chromium plated, spray coated (metal & plasma) and many other surface treated rings for various engines to enhance wear resistance. In other cases bronze or solid lubricants are embedded in working faces or rings are copper plated to assist bedding in and to provide an immediate seal.
  RING SET COMBINATIONS 

 

  

L&C holds large stocks of complete ring packs for a wide range of engine types. Ring packs are supplied an accordance with OEM specifications.

  EQUIPMENT FOR PISTON ROD AND COOLING PIPE STUFFING BOXES

 

  The main functions of stuffing boxes are to seal scavenging air from the crankcase whilst ensuring that the piston rod is lubricated in a controlled manner.

 

  L&C supplies a complete range of high quality scraper, sealing and tightening rings and sub-components for piston rod and cooling pipe stuffing boxes.

 

 

 
  L&C stocks include:

   For European and Japanese built MAN - B&W engines

For all relevant Sulzer engines:

 

  • Seal rings
  • Upper and lower bronze or cast rings iron scraper rings
  • All other consumables such as lamella, bronze segments and '0' rings
  • Seal rings
  • Upper and lower bronze scraper rings
  • '0' rings and springs and
    consumable spares for cooling pipe stuffing boxes
  QUALITY

  

  L&C producs are manufactured to OEM specifications and the relevant International Standards and are of the highest quality.

 

  PRODUCT RANGE AND STOCKS
  Lockwood & Carlisle holds large stocks in Sheffield. England which are distributed worldwide. Goods can be dispatched the same day to any destination.
  • Piston rings for two-stroke diesel engines
  • Piston rings for four-stroke diesel engines
  • Stuffing box equipment for two-stroke diesel engines
  • Compressor and pump rings
  • Special and oversize piston rings
  • Custom built metal seals
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